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aide pour resoudre les equations suivantes                                                                                       -3x-9y=-30                                                                                                                         3x+5y=18

Sagot :

{-3x-9y=-30                                                                                                                      {3x+5y=18
donc par somme -4y=-12
donc y=3 et x=1
donc S={(1;3)}

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